Improvement in rubber compounds for the manufacture of packings



various earths "heated, a vulcanized UNITED STATES cnnis'rorunn L Fmnir, or nocxvrnnn', oonsncrrcur menovrstsr m RUliBER cosrouuos ron THE MANUFACTURE or muses. tc.

Specification forming part of Letters Patent No. 142,908, dated September 16, 1873; application filed September 11, 1873.

To all when it my ooncemi Be it knownthat I, Omsrornnn L. Farm: of Rockville, 'in the county of Tolland an State of Connecticut, have made a, new and useful vImprovement in Rubber-Compounds,

to be used in packing the joints in steam'engines, pumps, pipes, tubes, and the like, and

for other grgrposes; and I hereby declare the following be a full and exact description of the same.

conforms to the place it is to fill, entering every seam and joint; and forming a perfect packing. My invention, therefore, consists in a composition of rubber, gutte-percha, or other vulcanizable gum and sulphur, in suitable proportions for vuicanizing, with the addition of oxides,'metallic filings, or other solid materia so as to forni in place, when packing. large number of compounds for rubber packing have been described, but they have always been vulcanized before being used or inserted in place; My invention differs in this, that I .form the material in the 'manner now employed, suitable for being vulcanized, and in this condition it is an article of manufactnre ready for use in fprming 'packings. It may be rolled into sheets, or made into the "form of rolls, strips, or inmass.

When used, itis inserted in the place-to be packed, and the action of the steam,'heated air, or other heating medium, will efl'ect the hardening or yulcaniziug. The proportion of sulphur to be added will depend upon the degree of hardness required in the paclIring.

use

When a soft compound is to be formed,

Heretofore a canizable gum.

sulphur ill the quantity required to form soft vulcanized rubber. For semibard, the requisite quantity for this compound, and for hard and very hard, the amount to form these re- 'spective compounds, is used. These, being well known to workers in rubber, need not be particularly specified.

To give body to the compound, and to give it the property of resisting the action of steam, oils, acids, gases, and the like, I add various earths, oxides, metal filings, and the like such as plumbago, litharge, white lead,'re lead, oxide of zinc, brass filings, or other metallic filings, soap-stone, steatite', Frenchchalk, emery, asbestus, mica, plaster of paris,

magnesia, barytes, infusorial earth, kaolin, or other earthy mineral substance.

When it is required to give lightness as well as elasticity to the compound, I add vegetable materials, such as paper-pulp, wood fiber, cork, or the like.

.act composition of'thematerial, but only to its condition, I will nota'ttempt to enumerate all the formulas by which the material is prepared. This varies with almost every special use to which the compound is apried.

The particular compound named in my for.- mer patent, above referredto, may be used. The following gives a good soft packing, viz: Rubber, ten parts; pl umbago, twenty parts; carbonate of load or litharge, six parts; brass filings, six parts: sulphur, two parts, all by weight.

Of course, by increasing the quantity of sula 'phur a'harder compound may be producedthat is, a compound which, when placed in position, willbe converted into a material re sembling what is known as'hard rubber. The

amount of earthy or solid materials may be v'ariedindefinitely, as-is well known in the forming of vulcanized steam gum packing,"

andthe like. I

Having thus described my invention, what I claim, and desire 'to secure by Letters Patent, 18

1. The improved method herein described for forming compounds for packing, the same consisting in combining rubber, or other vul-' with" sulphur and other solid PATENT OFFICE.

As my invention does not relate to thee):-

matorizi is, Esau as uam'ed, end vulcan'izing the phur andother solid moterials, such as named, ble

compound in the place to be paoke hsubstanso as to form non-vulcanized but vulca'niza compounds for use, as described t. FBINK;

tially as specified.

OHRISTGPH ER 2. The improved compounds herein de- Witnesses:

0LT. EARLE, 1. J. Rmzm.

scribed, suitable for steam and other packing, made by mixing, in proper proportions, indierubber, or other v'ulean'izable gum, with sul- 

